كتاب حضارة العرب

The former caliphs, who had a political genius who was rare in the advocates of the new religions, realized that the systems and religions were not coercive; they treated the people of each country with great gentleness, leaving them with their laws, systems, and beliefs, If it is measured by what they paid in exchange for maintaining security between them, it is true that the nations did not know the tolerant conquerors like the Arabs, nor the debt is as easy as their religion.